Sliming suit trouser leg

Bought a reiss suit today, very happy with the jacket fit, trousers have to be taken in an inch at the waist but I also want then slimmed as they are a bit baggy for my liking. It was reduced from 685euro to 450euro so this was a big factor too.

My question is, is there a point slimming the leg of an expensive suit or could it possibly end up messing up the whole trouser?

Should I just return the suit and get one that I know won't need to be slimmed.